John Evelsizer Olson, PA-C
NPI 1639483001 · Surgical Physician Assistant · Decorah, IA
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Evelsizer Olson, PA-C is a Surgical Physician Assistant provider in Decorah, IA (NPI 1639483001).
Provider details
- NPI number
- 1639483001
- Entity type
- Individual
- Primary specialty
- Surgical Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PA-C
- Sex
- Male
- Sole proprietor
- No
- License
- 082179 (IA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
16 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 5 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Meloxicam | 98 | 44 |
| Oxycodone Hcl | 72 | 50 |
| Celecoxib | 46 | 16 |
| Tramadol Hcl | 32 | 18 |
| Prednisone | 13 | 11 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Registry dates
- Enumerated
- 2010-07-28
- Last updated
- 2025-01-13
- Certified
- 2025-01-13
Frequently asked questions
- What is John Evelsizer Olson's NPI number?
- John Evelsizer Olson's National Provider Identifier (NPI) is 1639483001, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Evelsizer Olson's specialty?
- John Evelsizer Olson is listed in the NPPES registry with a primary specialty of Surgical Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is John Evelsizer Olson located?
- John Evelsizer Olson's practice location on file with NPPES is 901 Montgomery St, Decorah, IA 52101-2325.
- What is John Evelsizer Olson's phone number?
- The practice phone number listed in the NPPES registry for John Evelsizer Olson is (563) 382-2911.
- Does John Evelsizer Olson accept Medicare?
- John Evelsizer Olson is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Evelsizer Olson's NPI active?
- Yes — John Evelsizer Olson's NPI (1639483001) is active in the NPPES registry as of the last update on 2025-01-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.